The vast majority of speech sounds are made using pulmonic egressive air. It is also possible – though not usual – to speak while the air stream is flowing inwards to the lungs (ingressive air). When occasionally hear this air stream used in English when someone is trying to talk while laughing or crying,or when out of breath. Words such as yes and no are sometimes said with an ingressive air stream, when we use a ‘routine’ tone of voice to acknowledge what someone is saying. An alternate use of egressive and ingressive air stream is sometimes heard when people are counting rapidly, ‘under their breath’. But ingressive speech is of poor quality, muffled and croaky, and many people find it unpleasant to listen to. It is never put to routine use in everyday English speech.